I'm confused if it's talking about internet browser or search engines, but I'll answer both too.
I usually use Firefox when browsing (because the poll is about internet browser), but if you meant search engines, it's Google.

Google Chrome. Occasionally I'll use Firefox for whatever reason (like to make sure my usertitle looks good on both Firefox and Chrome) but otherwise I don't really use it anymore. It makes sharing my laptop with my sister easier though as I have my email logged in on Chrome and she usually logs in on Firefox. Same goes for some other sites we both use. And we're trustworthy of each other enough to not go poking around in each other's business either. As for search engine I use Google. Just the easiest to get to and everything imo.

Google Chrome on my main desktop and laptop, but I use Firefox on my server PC because I have found its performance to be better than Chrome. However, I don't use the browser on my server often and I have been a regular Chrome user since March of 2011, so it's difficult for me to back out of it as my main, everyday browser.

As for searching, I use Google. By default, you can see queries as you type in your keyword, which is something that cannot be done with Bing, and their maps are by far better than bing because they're user-edited and mistakes can be corrected by a community of people unlike bing's maps.

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